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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6701aff900a41b326d1f8cb7993095c55ff291e9987c221e3c1443829d25b2' 
  AND token = 'nPYckys4CXUx39U36/rMa1gX3QeuBHHqPRfLWhSzm8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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