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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a71dcc442f78266c5b82e2353547a869689a8c069ab8b2e2f0cc5d00f7969b3' 
  AND token = 'N4AmyxnqaYaNW92TtlG6pfxpXX5IfNIkUcF8WnGhCoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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