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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54963ca21e49acae0b7f258e1e7223c02bab501f1630373b569b83118cae9ae1' 
  AND token = 'OSOVLqn4oCZEzlPstTGurfKC6renyyO2wdZZsOP1UdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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