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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8629442606466ed5f2164ed36bb065e14185c960ab20aebf8651d7507d984f78' 
  AND token = 'A0jsj5jpIz0U1mOTKxrmnIo4+iF42gSKOQ988zCDYYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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