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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e7dc023567056b0cb767b73b226b3ac0d5a6abbeff94d9390988a2601c4653' 
  AND token = '652Rjwx1kcJql8bXPXBQhlcMqh0oZtZwrSfkux1WwL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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