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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad0edef31cbcd5f5a3b7f5c30f3c7ed601daa1eccd1e7c8b1ebe9380ed79246' 
  AND token = '6kDu/qqzEAtyBftItZLAqtlVpuFzCp3fcoPotvnjigc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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