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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0882b511fb938d9c33e1eee87d0143a65e10e58fb237ff1bc434907808de9573' 
  AND token = 'rzs1R41vraK0x2S2OYBd/5w9Ta9p5iDeHwqNZ9YVZqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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