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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334b7abb42703e747f50282e43b7fc66ec45a402af08917345c4c986afd4907e' 
  AND token = 'Kt61t/ICvNHJje7+Q5+MSNAv5e/gSX4pBk7pU1+VstY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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