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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cc38b8138abf9d6bd76362164b2f7df77dae8c5645c59735b6c1cd81a85c39' 
  AND token = 'xyrOT9989MqbNd6B6KWXZhUtuTN+cGgsnOHSUsjA/w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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