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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8e573951c2c64162b1db6a8813db9ad1f944b0916ef363b61f30e14d38edb6' 
  AND token = 'PN40BbaW22IAVNOfHsmHRy4z7ZjqiWNWl4kJ3yV8mBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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