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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722a771af799c932c71639bd4b8318d49149bb401d89f5107b8b42d6755a3ecb' 
  AND token = 'f+3Kz4cfNyn8sbSM864Wb0QSrnfZtrkZDe5hFtgN28U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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