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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073b87990a2845972b382be709788361dcc0ecee95c7dd78f61fe4d8c1193195' 
  AND token = '8ECmKQrQmbruLbSwW/1tOFnSu0Pwh1SVtuX1Pf4ZFLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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