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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938cf330026ca7f25a04d536fb9a7f44a1085b0876853df75fa37ffcd2ef5a19' 
  AND token = 'wFhXhW9RooXbFS2Z5KaJL6OnVyKtf4RWoc1Rg/ybIzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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