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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b438861700f85b1cde8372edffeed7ffcb33b46999042892d53e706aba496f85' 
  AND token = '1yuR0O9HeSR+PBpeLHs1Rg3uy/FGssXwuHTvUC/0o7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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