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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aedd89c4f4981a04e3dbca406ccba5f54af911698f4d6ceda8bd62b4bf9b6dc' 
  AND token = 'sUA+CSLpjJ/RJSsM55JKgqi4oMZjZfwIJ0Ei8j7wReM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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