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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a88698835b7f79b83de1ca60c543338d15d1bbc21a9e290132132e36980d05' 
  AND token = 'AOnAxr4fjmWweuIeVfB2BEZ5shsq66uEInk+a+tn8a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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