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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '486b9587af4ee86a918c4ae8dc3737af8702a57ba4dabb8a796bf8f5e86445e8' 
  AND token = '1m6eTgtuTuf2uKgzBxSCbrlRc9KsO2HT7U6rde4kE2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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