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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773c3d339f1b044de4506f9973368fe8b58a3758beeb03d25a89938ce326e10e' 
  AND token = 'aUY2HBtQwjDWE59KW+ywaqK4Xt2T1WeJ1vlakIgwSMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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