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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4f223a14b6ddb61d04dac868553897409dcb04247b258ae2ea41ecb5a0e8bf' 
  AND token = 'Yq8jl5Wg6wy+6lsYlqw4CsY954zCwfI2CjP7Ic4wMbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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