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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973bfc0b0cd2af3c419d016d61c7c0cf24f7d86469f9b9cd3bb028878e6ebc77' 
  AND token = 'xqphFC+DOUKoLuqHHchijq+8Modlc04L3STLpvcJXzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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