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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63eeefcb329d94773e52c53a2bbdb9e828bdf45e427555a67548b115923e7f3' 
  AND token = 'rRIlAQfxEW9JE3lt5UTXZmCTNWwKPeuOFcNOnuQMITM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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