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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0861371016199c7f3e29699374e5ba533bd50cee0bc38562b94a28a3933af5ec' 
  AND token = 'h+XR2tIDGv688ps6mXyhCicvGo8Uhpmv9rIU+wzc8Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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