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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a9b2890f04a133eb71fdf5c2e004fe2ea53a7e50e7e4f637ab3b70a1a85da1' 
  AND token = 'A8F10rZTyQX0G6qMet7Zdc52rQu/woHdcEbY2KDRW7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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