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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa5fcf194749637a853f9d01a10ef1a36fc3c7a4ec4c7fe99e35464250a9b9c' 
  AND token = 'dGcNlzmhvz5Cgk1jNLvm17b5vI64U/3l0LVJq4Np6Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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