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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964b6ec206b6e5dbb1668c5dd78f4849253e3bc2efde105543bba85417aaeceb' 
  AND token = 'ypXV7O8HHD5ZDqjY9PLkobra80yvIsWik0UOveQrdqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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