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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e86596b5685e7a227d80e8af438e50e078f9e88b0688179c527500e0ad9366' 
  AND token = 'Itml6lHn4BhluVkuWFWnZhXZIguYJPoxtZeR8gTrbZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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