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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c219aba0b9e0c0a78acfe10c3906bd285dbdbcf9b0b8ad784db3bfc504cb40' 
  AND token = 'v1rzgH4BVQ9Znrwz3FNBdNZpMFeBacfWUq2hV/hDSao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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