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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adc4198949de096e64908f16ff1077be8529ffecd0ac6ecb174f3a8e6a12eb7' 
  AND token = 'B6brn2EjVMXML2tY6A9CdfECb7H1odwkM8u8g+SNcPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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