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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08291efa9d2fdf9bff406e81361ad40b5b617bf369c45bb155c551e5f41d014c' 
  AND token = 'SOXn7x1waKETkwAETTe4FIH5Cv+zia2O2Fe8oCm2VjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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