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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10a0885c93bf9dfd5045cd91330788396944007697003618cfb055d9aabce2c' 
  AND token = 'Oow6f7YYFWWbPdwWKaXdEHpjrI7XBEK7X6XD/H7JLec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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