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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a76521602ff11ffc9b1ec152c00a8854344dcf6f6b0308dba05d4049f269105' 
  AND token = '2V0GRWnoY4SP0uIBdGbKnuK6Zmjw2sj17ONJXgtvPmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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