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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1a0a282c774be0034316c4b7525b4190f2df9c3925f05b192f206d6c2a824f' 
  AND token = 'd7XjCsAdi3JD9h3SZRYl3ooOxe1+/gxIdans3iX/s6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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