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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d773df990f0fe44704d6361b3f2d382fcad0709b15512866c291c855a3a4f98' 
  AND token = 'LOCFLE58kRwyiR1uSyqbvK9F9LWguL6XWTXLG7QYI9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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