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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0b471c2fe82a41ed4316823de97f7f6700f7f5b52dc64aea9688ff0c295ff7' 
  AND token = 'KpvP7R/ttERS8wY0X28UytuAmFP+vL064xDZ3l+f7xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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