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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f43f36e63509af1139f104b2295e1091f2260bb8f72af04f07d77cdfa9e350' 
  AND token = '6NbUEEk925AHB/ZeIpEyYmxdCGHeJoRrWR/V+/m2oEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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