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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b02dd852078f393353af1552f9a38e21a365b5a982b19e25994999aec14c0c6' 
  AND token = 'AgIxX5PSzCbdxLzI6SPBQhRAjwR0Es9VzJg+QOi85+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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