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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0858bd0cea0e8cca04dd9942b448baa448094f469edba6dc9784f7bce03785a3' 
  AND token = '+LWgD9ykazq/Ue605sIflrG7Z6A1tJQ3x6jFUJYsS50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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