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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b29dd5c6f9325fed89cfa2c6e0e67779574e3a2447121701acaa035ef79c03' 
  AND token = '2GHx9WPaS7eiC8fStJVy8Aonz1pNBXkzxkV8TSl/XyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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