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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c542b9f53dc966565b4410b6535e75ead0c7fcc8c44c56fc37e8b20a9255c5' 
  AND token = 'gLz1amXwObiPxjxqJeHypuxnjfxP0iB2jom2lLBM72I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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