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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c75c4b0daf7eea198d5cf9ad81763948ec7b10543082fde9a65c09ef80c623' 
  AND token = 'tBXrnovcg5MUGgCnsGQoUPMoXTtImcZDF+ZpSktE4uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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