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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a032128d4a7f0aa30e36beff4726e71419cda742d28c83e9141d8111e8bde76d' 
  AND token = 'bor+fG026d581cDtezNfxUOEZqvpIt0XUuGlBr7KjbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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