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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f903b5ec5282aa7b333aca1979bc3f8af1e6cd8e47c0a57864c7a8eb2a7a16ba' 
  AND token = '9f1s5CiqwiLDsCbtfqwlbay8JYf2Gfif8oC5B2DbKjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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