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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c35a026b8f207c11f1ed54ab3aeb32f04075a18da06e348b732fee28339ee57' 
  AND token = 'HnDnDpclJS5CYu6I+3VHKLVn1NZM+tAbJesh1/nSNic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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