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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2c1dd6c95de8d34ce6fa1bc887777fce011ff78d18277978291e5fe6fe4db0' 
  AND token = 'xaJa8Rtnumn33R5IAMa63wT4hp9ZYVJp6TfRfnqEv8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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