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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b4f4b61f1b99e37c36384a8d32433bdf77300c91e07ad46183f7b171f5c757' 
  AND token = 'DuFI62yzwUhiCLSeB+j0sgGu69H7I5Whm7xzNot5y8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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