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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da45c24239524403e8b7a6b2e8dc415205b660016878b9d18e705d3be3f22a8' 
  AND token = '276HfK5XqKPVg23UzJlHLq3gbgd+pnL3iK2UkvvtP3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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