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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03a5a29b282246854fdebd04f665f46e499017972e961f0fb56cab5c6ff1a8c' 
  AND token = 'U2JAnbSX9Kc7ihDu6wzCUacto8drfHh0eEw3qFpB6JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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