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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdf9e3147bba497f9bb8e7a301f82592c0badd254ceee29cee2aed66e01bc4a' 
  AND token = 'EyOhPVuSWLHtu/rBU3nH6xrWVpHRvl2FUxc4f2T1etY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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