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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f2fa6153b7b78f13507da49742e298375447acbffe823e1aee3dcf19a2b768' 
  AND token = 'cNhLR9y0ra1Ma5MTwJXOwjWO2vF8tURGHimoMOCqMsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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