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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4057ae9e1d9ae8258ab188aed41dcc4c335907d2bb89546c3a25d9e8b6e808' 
  AND token = '2SX9qkhww98vzy3slGv3Los7l+DPtcoR/KVUu+Ixaa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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