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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1591aac382eed4e2b3c48a98bf3edb485bf1681aadf60fd8b94f7dc00feb1d18' 
  AND token = 'Hpp4k5traFCiTg7IV/hikdSkbufPgF6BsrlBXmiU/P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}