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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d6f752a4772b9de5c3549537ba863bbda3fed4d9bc4166d40850330efdb20f' 
  AND token = 'ps4RJMjz6U6hP3TvshtKu4yvWSEaldM0HllFoAvekqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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