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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b217dec415e05e227284ce8848712e58a5782e72364a9a164fd595d625abfe19' 
  AND token = 'P0QfdneJIG52UPYU9rTWvIR/80Q5XhOytkSNb2p6C/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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