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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b3bd4d280a1a6edb01ba0e7023c9f17a349920737f773cdafd684287137469' 
  AND token = 'g4LAIp7Mzy1xWPtNFxOL02rhQGKzqCepY2CT3iuMhSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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