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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e352e2d0a2f158da7724b50409e8ad3f0632ab66a11350eeadcf712dd68aa20e' 
  AND token = 'PHZdWzOkoT53jm1enLla36Hnw6wk+0zoOOiVn5Kyz8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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