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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d82f86255b16d5c3e97fdd85072813bfcf4cb9031b1151858c786ce4a79b4c4' 
  AND token = 'pi30gzIQjVE5GS1R4v7eDmf6G4LF3T7juJ7ECmApQjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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