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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3148a0564e3d23d45ae771cb16cc2ef424c7d7e3db3cd7540b3e1527c7714de' 
  AND token = '0Wh69N2tjqpbpNEWqMfi5Z5ylIB4w8Pv1wVZvgLUXAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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