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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08067625c5b92620c9349100e18bd867ab9be5a95a319f901bfc788fdaeb0f3' 
  AND token = 'EbCPiUnUimPG33fci7boocrOftZuzIiZ654AQh5G2rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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