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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3c6b5a56bf228b1bdf760768d3888fa5f1032cf9598e92b2bfa7d225c8271e' 
  AND token = 'AAbFBykIwxrZEPHD7xGeQQEPbpG/A8bhkbpXV1cEUW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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