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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88b20d84d64fd9bf9817f070b32f04eb69a9e5561a8268d05fc4fa81be392f7' 
  AND token = 'BmkJISPZifwBKwBEHRRQI1f7d2W3/QtTww98K6nihec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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