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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db5f10950ac06648b0dd8e32f2c370232bb2ba5e47e992558fa5bc9c7dfb56d' 
  AND token = '5SxL3REQhpfcJ68TcO8TPi2hDqSP664DK1gAAoVNoCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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