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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760b52e39f5dd953d3b10eb34e265e5c5fd1a488a943cf46de39ffb1bb6aaa9c' 
  AND token = 'KkShYBIYq1m2uzSU2z01MTmpP/03jgYU5xowA9B1i00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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